Public Class frmMain

    Private Sub ButtonX1_Click(sender As System.Object, e As System.EventArgs) Handles ButtonX1.Click
        frmQuanLy.ShowDialog()
    End Sub

    Private Sub ButtonX2_Click(sender As System.Object, e As System.EventArgs) Handles ButtonX2.Click
        Dim frm As New frmChangeConnect
        frm.ShowDialog()
    End Sub
End Class